Best Spark Plugs and Wires for a 78 GS750?

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  • alkswheetinjur
    • Mar 2026

    #1

    Best Spark Plugs and Wires for a 78 GS750?

    Recently lost spark on one cylinder and I am assuming I need a plug wire. Tried a swapping plugs and no spark, swapped plug wires and its back. The "bad" wire has visible corrosion leading me to think the others are probably on their way out as well. I am looking to upgrade and was wondering what the best options for performance and reliability would be. Also will be replacing plugs if their are any suggestions in that department. Running a Dyna S ignition with Dyna 3ohm green coils. Thanks.
  • Cipher
    Forum Sage
    • Mar 2016
    • 3129
    • Toronto Ontario

    #2
    NGK as per OEM??
    1983 GS 550 LD
    2009 BMW K1300s

    Comment

    • alkswheetinjur

      #3
      Currently running NGK plugs nothing to complain about just wondering if there's something better out there. As far as wires, I like the looks of the red NGK racing wires but can't find any direct fit/don't know exactly what I should be looking for. Anybody using these?
      Last edited by Guest; 05-11-2017, 08:21 PM.

      Comment

      • Nessism
        Forum LongTimer
        GSResource Superstar
        Past Site Supporter
        Super Site Supporter
        • Mar 2006
        • 35808
        • Torrance, CA

        #4
        NGK B8ES plugs

        Copper core 7mm wires w/resistor caps

        It's hard to beat the stock configuration
        Ed

        To measure is to know.

        Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

        Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

        Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

        KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

        Comment

        • 60ratrod

          #5
          i ordered cut to length 8mm suppression core wires for both my 81 gs650g and 81 kz1000 and the wires were fantastic! and both bikes had dyna s systems with dyna green 3.0 coils

          Comment

          • Steve
            GS Whisperer
            • Jun 2005
            • 35927
            • southwest oHIo

            #6
            Originally posted by 60ratrod
            i ordered cut to length 8mm suppression core wires for both my 81 gs650g and 81 kz1000 and the wires were fantastic!
            Are you also running the usual resistor plug caps?

            You can run suppressor wires, resistor caps or resistor plugs. Just ONE of the three.

            .
            sigpic
            mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
            hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
            #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
            #2 son: 1980 GS1000G
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            Comment

            • Guest

              #7
              For my 900F, I bought a set of plug wires for a Chevy Cavalier on eBay. They are resistor wires. Pretty inexpensive, and the bike runs great.



              Comment

              • 60ratrod

                #8
                Originally posted by Steve
                Are you also running the usual resistor plug caps?

                You can run suppressor wires, resistor caps or resistor plugs. Just ONE of the three.

                .
                it was just the suppressor wires. I stopped using the suppressor caps when I switched to the dyna coils. the only real reason I went with the suppressor cores is because they were the only ones I could find at a reasonable price that were 8mm. and I bought the set of 8 so I could have wires for both bikes lol.

                Comment

                • Darin Jordan

                  #9
                  Getting ready to order some NGK BP8ES plugs for my 1980 GS850GT as well. That's what's in it now. However, I am seeing that there are TWO varieties of this plug:

                  BP8ES SOLID/3994 - Non-Projected

                  BP8ES/2912 - Resistor - Projected

                  I can't recall which we use. I'm assuming the BP8ES SOLID - 3994, but could someone please confirm this??

                  Thanks!!

                  Comment

                  • Darin Jordan

                    #10
                    Originally posted by Darin Jordan
                    Getting ready to order some NGK BP8ES plugs for my 1980 GS850GT as well. That's what's in it now. However, I am seeing that there are TWO varieties of this plug:

                    BP8ES SOLID/3994 - Non-Projected

                    BP8ES/2912 - Resistor - Projected

                    I can't recall which we use. I'm assuming the BP8ES SOLID - 3994, but could someone please confirm this??

                    Thanks!!
                    Actually, I think I'm off... I have B8ES - 2411, not BP8ES... NGK application guide is useful and protects you from yourself!

                    Comment

                    • Dre

                      #11
                      I bought some new boots for my cables but are the cables themselves replacable? Arent they connected directly to the coils? And should I use 7mm replacement ones and does it matter which ones? Sorry. Thats alot of questions. Haha

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